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/*
int2tap - Convert an Intel segment file to a loadable Spectrum tape file
Copyright (C) 2004 Ian Cowburn (ianc@noddybox.demon.co.uk)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-------------------------------------------------------------------------
A Spectrum BASIC line is constructed:
<2-byte line number HI/LO>
<2-byte length including RET LO/HI>
<Data>
<RET - 0x0d>
*/
static const char id[]="$Id$";
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include "basic.h"
static const char header_id[]=I2T_BASIC_H;
/* ---------------------------------------- CONSTANTS
*/
#undef TRUE
#undef FALSE
#define TRUE 1
#define FALSE 0
/* Types for AddLine()
*/
#define TYPE_END 0
#define TYPE_TOKEN 1
#define TYPE_STRING 2
/* Constants for some tokens
*/
#define TOK_VAL 176
#define TOK_QUOTE 34
#define TOK_CODE 175
#define TOK_USR 192
#define TOK_LOAD 239
#define TOK_RAND 249
#define TOK_CLEAR 253
/* ---------------------------------------- GLOBALS
*/
extern const char *progname;
static unsigned char mem[0x10000];
static unsigned endptr;
static unsigned line_no;
/* ---------------------------------------- PRIVATE FUNCTIONS
*/
static void Poke(unsigned char b, int *len)
{
if (len)
{
(*len)++;
}
mem[endptr++]=b;
}
static void AddLine(int type, ...)
{
va_list va;
int len;
unsigned char *len_ptr;
Poke(line_no>>8,NULL);
Poke(line_no&0xff,NULL);
line_no+=10;
len_ptr=mem+endptr;
endptr+=2;
len=0;
va_start(va,type);
while(type!=TYPE_END)
{
char *str;
switch(type)
{
case TYPE_TOKEN:
Poke(va_arg(va,int),&len);
break;
case TYPE_STRING:
str=va_arg(va,char *);
Poke(TOK_QUOTE,&len);
while(*str)
{
Poke(*str++,&len);
}
Poke(TOK_QUOTE,&len);
break;
default:
break;
}
type=va_arg(va,int);
}
Poke(0x0d,&len);
*len_ptr++=len&0xff;
*len_ptr=len>>8;
}
/* ---------------------------------------- INTERFACES
*/
void BasicInit(void)
{
endptr=0;
line_no=10;
}
void BasicClearLine(unsigned val)
{
char no[64];
sprintf(no,"%u",val);
AddLine(TYPE_TOKEN,TOK_CLEAR,
TYPE_TOKEN,TOK_VAL,
TYPE_STRING,no,
TYPE_END);
}
void BasicLoadLine(void)
{
AddLine(TYPE_TOKEN,TOK_LOAD,
TYPE_TOKEN,TOK_QUOTE,
TYPE_TOKEN,TOK_QUOTE,
TYPE_TOKEN,TOK_CODE,
TYPE_END);
}
void BasicRandUsr(unsigned val)
{
char no[64];
sprintf(no,"%u",val);
AddLine(TYPE_TOKEN,TOK_RAND,
TYPE_TOKEN,TOK_USR,
TYPE_TOKEN,TOK_VAL,
TYPE_STRING,no,
TYPE_END);
}
const unsigned char *BasicBase(void)
{
return mem;
}
const unsigned BasicLength(void)
{
return endptr;
}
/* END OF FILE */
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